diff --git a/floatimg.h b/floatimg.h
index 272c0593..1967db0a 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -2,7 +2,7 @@
  *	floatimg.h
  */
 
-#define		FIMG_VERSION	88
+#define		FIMG_VERSION	89
 
 /*
  *	in memory descriptor
@@ -75,6 +75,11 @@ int fimg_mul_3(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_minimum(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_maximum(FloatImg *a, FloatImg *b, FloatImg *d);
 
+
+/*	'sfx0' module 			*/
+int fimg_killcolors_a(FloatImg *fimg, float fval);
+
+
 /*	PNM files module		*/
 int fimg_save_as_pnm(FloatImg *head, char *fname, int flags);
 int fimg_load_from_pnm(char *fname, FloatImg *head, int notused);
diff --git a/funcs/Makefile b/funcs/Makefile
index 55fa0feb..10ab5916 100644
--- a/funcs/Makefile
+++ b/funcs/Makefile
@@ -3,7 +3,7 @@
 COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
 DEPS = ../floatimg.h Makefile
 OBJS = fimg-png.o fimg-tiff.o misc-plots.o filtrage.o utils.o	\
-	fimg-libpnm.o rampes.o
+	fimg-libpnm.o rampes.o sfx0.o
 
 #---------------------------------------------------------------
 
@@ -30,6 +30,9 @@ misc-plots.o:		misc-plots.c $(DEPS)
 filtrage.o:		filtrage.c $(DEPS)
 	gcc $(COPT) -c $<
 
+sfx0.o:			sfx0.c $(DEPS)
+	gcc $(COPT) -c $<
+
 rampes.o:		rampes.c $(DEPS)
 	gcc $(COPT) -c $<
 
diff --git a/funcs/sfx0.c b/funcs/sfx0.c
new file mode 100644
index 00000000..d602691e
--- /dev/null
+++ b/funcs/sfx0.c
@@ -0,0 +1,37 @@
+/*
+ *		FLOATIMG
+ *	rampes diverses, trucs etranges 
+ */
+
+#include  <stdio.h>
+
+#include  "../floatimg.h"
+
+/* --------------------------------------------------------------------- */
+/*
+ *	OMG ! a Color Graphic Adaptor emulator :)
+ */
+int fimg_killcolors_a(FloatImg *fimg, float fval)
+{
+int		nbpix, foo;
+
+if (FIMG_TYPE_RGB != fimg->type) {
+	fprintf(stderr, "%s: bad src type %d on %p\n", __func__,
+					fimg->type, fimg);
+	return -8;
+	}
+
+nbpix = fimg->width * fimg->height;
+
+for (foo=0; foo<nbpix; foo++) {
+
+	if (fimg->R[foo] > fimg->G[foo])
+		fimg->B[foo] = fimg->R[foo];
+	else
+		fimg->B[foo] = fimg->G[foo];
+	
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
diff --git a/funcs/t.c b/funcs/t.c
index 8e33468b..b6eff52b 100644
--- a/funcs/t.c
+++ b/funcs/t.c
@@ -10,6 +10,25 @@
 
 int		verbosity;
 
+int fimg_killcolors_a(FloatImg *fimg, float fval);
+
+/* --------------------------------------------------------------------- */
+int essai_sfx0(char *infile)
+{
+FloatImg	fimg;
+int		foo;
+
+fimg_create(&fimg, 512, 512, FIMG_TYPE_RGB);
+
+fimg_draw_something(&fimg);
+foo = fimg_save_as_pnm(&fimg, "something.pnm", 0);
+
+foo = fimg_killcolors_a(&fimg, 0.0);
+
+foo = fimg_save_as_pnm(&fimg, "colorskilled.pnm", 0);
+
+return 0;
+}
 /* --------------------------------------------------------------------- */
 int essai_parse_double(void)
 {
@@ -44,7 +63,10 @@ char		*fname;
 foo = format_from_extension(fname="foo.fimg");
 printf("%-10s %d\n\n", fname, foo);
 
-foo = format_from_extension(fname="foo.pNm");
+foo = format_from_extension(fname="foo.pnm");
+printf("%-10s %d\n\n", fname, foo);
+
+foo = format_from_extension(fname="foo.png");
 printf("%-10s %d\n\n", fname, foo);
 
 foo = format_from_extension(fname="foo.xyzzy");
@@ -103,7 +125,7 @@ int		foo;
 
 puts("++++++++++++++++++++++++++++++++");
 
-foo = essai_rampes();
+foo = essai_sfx0(NULL);
 
 return 0;
 }